Free Alibaba ACA-Cloud1 Exam Actual Questions

The questions for ACA-Cloud1 were last updated On May 7, 2025

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Question No. 1

Some applications may encounter large traffic fluctuations within a short period. When ECS is used with __________ , the number of ECS instances is automatically adjusted based on traffic.

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Correct Answer: C

According to the Alibaba Cloud Academy, Auto Scaling is a service that automatically creates and releases ECS instances based on pre-defined rules in order to scale services to match demand. Furthermore, it can configure server load balancer and relational database service white lists, without any manual intervention. Therefore, when ECS is used with Auto Scaling, the number of ECS instances is automatically adjusted based on traffic.Reference:Introduction to Alibaba Auto Scaling - Cloud Academy,ACA Cloud Computing Exam Preparation Course - Alibaba Cloud, Module 4: Cloud Computing Elasticity, Lesson 1: Auto Scaling, Slide 2.


Question No. 2

If you are running an online ticket booking service with relatively fixed traffic, then which kind of charging mode is more suitable for you?

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Correct Answer: B

Prepaid is a charging mode that allows you to pay in advance for a certain amount of resources for a specified period of time. It is also known as subscription or reserved instance. Prepaid is more suitable for scenarios with relatively fixed traffic, such as an online ticket booking service, because it offers lower prices and more stable performance than pay-as-you-go. Pay-as-you-go is a charging mode that allows you to pay only for the resources you actually use on an hourly basis. It is more suitable for scenarios with unpredictable or fluctuating traffic, such as a news website or a social media platform. Paypal-pay and bitcoin-pay are not valid charging modes for Alibaba Cloud Computing products.


Question No. 3

RDS provides whitelist access policies. You can set permitted IP addresses and IP network segments to effectively prevent hackers from attacking the server by port scanning.

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Correct Answer: A

A is the correct answer because RDS provides whitelist access policies that allow you to set permitted IP addresses and IP network segments to effectively prevent hackers from attacking the server by port scanning. A whitelist is a security feature that specifies the IP addresses or CIDR blocks that are allowed to access your RDS instance. By default, the whitelist is empty, which means that no IP address can access your RDS instance. You can add IP addresses or CIDR blocks to the whitelist according to your business needs. You can also create multiple whitelist groups and assign different IP addresses or CIDR blocks to each group.This can help you manage the access permissions of different users or applications12


Question No. 4

A/An is a copy of data on a disk at a certain point in time.

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Correct Answer: B

A snapshot is a copy of data on a disk at a certain point in time. It is used to back up and restore data, or create custom images.Snapshots can capture the data of system disks, data disks, and shared block storage devices1.


Question No. 5

Which of the followings are not the operations that you can do on a cloud disk snapshot? (Choose two.)

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Correct Answer: A, C

According to the Alibaba Cloud Academy, a cloud disk snapshot is a point-in-time backup of a cloud disk. You can use snapshots to back up data, create images, or restore data. The operations that you can do on a cloud disk snapshot are snapshot creation, snapshot deletion, snapshot rollback, and snapshot sharing. Snapshot duplicate and snapshot download are not the operations that you can do on a cloud disk snapshot. Therefore, the options A and C are the correct answers.Reference:Snapshot Overview - Alibaba Cloud Documentation Center,ACA Cloud Computing Exam Preparation Course - Alibaba Cloud, Module 3: Cloud Computing Storage, Lesson 2: Snapshot, Slide 2


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